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clang-p2996/lldb/unittests/ObjectFile/ELF/TestObjectFileELF.cpp
Kazuki Sakamoto b0b9605a54 [lldb][ObjectFileELF] Set ModuleSpec file offset and size 
In Android API level 23 and above, dynamic loader is able to load .so file
directly from APK.
https://android.googlesource.com/platform/bionic/+/master/
android-changes-for-ndk-developers.md#
opening-shared-libraries-directly-from-an-apk

ObjectFileELF::GetModuleSpecifications will load a .so file, which is page
aligned and uncompressed, directly from a zip file. However it does not
set the .so file offset and size to the ModuleSpec. Also crc32 calculation
uses more data than the .so file size.

Set the .so file offset and size to the ModuleSpec, and set the size to
MapFileData length argument. For normal file, file_offset should be zero,
and length should be the size of the file.

Differential Revision: https://reviews.llvm.org/D152757
2023-06-20 15:00:09 -07:00

311 lines
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//===-- TestObjectFileELF.cpp ---------------------------------------------===//
//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
#include "Plugins/SymbolFile/Symtab/SymbolFileSymtab.h"
#include "TestingSupport/SubsystemRAII.h"
#include "TestingSupport/TestUtilities.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/Section.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
using namespace lldb_private;
using namespace lldb;
class ObjectFileELFTest : public testing::Test {
SubsystemRAII<FileSystem, HostInfo, ObjectFileELF, SymbolFileSymtab>
subsystems;
};
TEST_F(ObjectFileELFTest, SectionsResolveConsistently) {
auto ExpectedFile = TestFile::fromYaml(R"(
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_X86_64
Entry: 0x0000000000400180
Sections:
- Name: .note.gnu.build-id
Type: SHT_NOTE
Flags: [ SHF_ALLOC ]
Address: 0x0000000000400158
AddressAlign: 0x0000000000000004
Content: 040000001400000003000000474E55003F3EC29E3FD83E49D18C4D49CD8A730CC13117B6
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x0000000000400180
AddressAlign: 0x0000000000000010
Content: 554889E58B042500106000890425041060005DC3
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000601000
AddressAlign: 0x0000000000000004
Content: 2F000000
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000601004
AddressAlign: 0x0000000000000004
Size: 0x0000000000000004
Symbols:
- Name: Y
Type: STT_OBJECT
Section: .data
Value: 0x0000000000601000
Size: 0x0000000000000004
Binding: STB_GLOBAL
- Name: _start
Type: STT_FUNC
Section: .text
Value: 0x0000000000400180
Size: 0x0000000000000014
Binding: STB_GLOBAL
- Name: X
Type: STT_OBJECT
Section: .bss
Value: 0x0000000000601004
Size: 0x0000000000000004
Binding: STB_GLOBAL
...
)");
ASSERT_THAT_EXPECTED(ExpectedFile, llvm::Succeeded());
auto module_sp = std::make_shared<Module>(ExpectedFile->moduleSpec());
SectionList *list = module_sp->GetSectionList();
ASSERT_NE(nullptr, list);
auto bss_sp = list->FindSectionByName(ConstString(".bss"));
ASSERT_NE(nullptr, bss_sp);
auto data_sp = list->FindSectionByName(ConstString(".data"));
ASSERT_NE(nullptr, data_sp);
auto text_sp = list->FindSectionByName(ConstString(".text"));
ASSERT_NE(nullptr, text_sp);
const Symbol *X = module_sp->FindFirstSymbolWithNameAndType(ConstString("X"),
eSymbolTypeAny);
ASSERT_NE(nullptr, X);
EXPECT_EQ(bss_sp, X->GetAddress().GetSection());
const Symbol *Y = module_sp->FindFirstSymbolWithNameAndType(ConstString("Y"),
eSymbolTypeAny);
ASSERT_NE(nullptr, Y);
EXPECT_EQ(data_sp, Y->GetAddress().GetSection());
const Symbol *start = module_sp->FindFirstSymbolWithNameAndType(
ConstString("_start"), eSymbolTypeAny);
ASSERT_NE(nullptr, start);
EXPECT_EQ(text_sp, start->GetAddress().GetSection());
}
// Test that GetModuleSpecifications works on an "atypical" object file which
// has section headers right after the ELF header (instead of the more common
// layout where the section headers are at the very end of the object file).
//
// Test file generated with yaml2obj (@svn rev 324254) from the following input:
/*
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_X86_64
Entry: 0x00000000004003D0
Sections:
- Name: .note.gnu.build-id
Type: SHT_NOTE
Flags: [ SHF_ALLOC ]
Address: 0x0000000000400274
AddressAlign: 0x0000000000000004
Content: 040000001400000003000000474E55001B8A73AC238390E32A7FF4AC8EBE4D6A41ECF5C9
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x00000000004003D0
AddressAlign: 0x0000000000000010
Content: DEADBEEFBAADF00D
...
*/
TEST_F(ObjectFileELFTest, GetModuleSpecifications_EarlySectionHeaders) {
std::string SO = GetInputFilePath("early-section-headers.so");
ModuleSpecList Specs;
ASSERT_EQ(1u, ObjectFile::GetModuleSpecifications(FileSpec(SO), 0, 0, Specs));
ModuleSpec Spec;
ASSERT_TRUE(Specs.GetModuleSpecAtIndex(0, Spec)) ;
UUID Uuid;
Uuid.SetFromStringRef("1b8a73ac238390e32a7ff4ac8ebe4d6a41ecf5c9");
EXPECT_EQ(Spec.GetUUID(), Uuid);
}
TEST_F(ObjectFileELFTest, GetModuleSpecifications_OffsetSizeWithNormalFile) {
std::string SO = GetInputFilePath("liboffset-test.so");
ModuleSpecList Specs;
ASSERT_EQ(1u, ObjectFile::GetModuleSpecifications(FileSpec(SO), 0, 0, Specs));
ModuleSpec Spec;
ASSERT_TRUE(Specs.GetModuleSpecAtIndex(0, Spec)) ;
UUID Uuid;
Uuid.SetFromStringRef("7D6E4738");
EXPECT_EQ(Spec.GetUUID(), Uuid);
EXPECT_EQ(Spec.GetObjectOffset(), 0UL);
EXPECT_EQ(Spec.GetObjectSize(), 3600UL);
EXPECT_EQ(FileSystem::Instance().GetByteSize(FileSpec(SO)), 3600UL);
}
TEST_F(ObjectFileELFTest, GetModuleSpecifications_OffsetSizeWithOffsetFile) {
// The contents of offset-test.bin are
// - 0-1023: \0
// - 1024-4623: liboffset-test.so (offset: 1024, size: 3600, CRC32: 7D6E4738)
// - 4624-4639: \0
std::string SO = GetInputFilePath("offset-test.bin");
ModuleSpecList Specs;
ASSERT_EQ(
1u, ObjectFile::GetModuleSpecifications(FileSpec(SO), 1024, 3600, Specs));
ModuleSpec Spec;
ASSERT_TRUE(Specs.GetModuleSpecAtIndex(0, Spec)) ;
UUID Uuid;
Uuid.SetFromStringRef("7D6E4738");
EXPECT_EQ(Spec.GetUUID(), Uuid);
EXPECT_EQ(Spec.GetObjectOffset(), 1024UL);
EXPECT_EQ(Spec.GetObjectSize(), 3600UL);
EXPECT_EQ(FileSystem::Instance().GetByteSize(FileSpec(SO)), 4640UL);
}
TEST_F(ObjectFileELFTest, GetSymtab_NoSymEntryPointArmThumbAddressClass) {
/*
// nosym-entrypoint-arm-thumb.s
.thumb_func
_start:
mov r0, #42
mov r7, #1
svc #0
// arm-linux-androideabi-as nosym-entrypoint-arm-thumb.s
// -o nosym-entrypoint-arm-thumb.o
// arm-linux-androideabi-ld nosym-entrypoint-arm-thumb.o
// -o nosym-entrypoint-arm-thumb -e 0x8075 -s
*/
auto ExpectedFile = TestFile::fromYaml(R"(
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_ARM
Flags: [ EF_ARM_SOFT_FLOAT, EF_ARM_EABI_VER5 ]
Entry: 0x0000000000008075
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x0000000000008074
AddressAlign: 0x0000000000000002
Content: 2A20012700DF
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000009000
AddressAlign: 0x0000000000000001
Content: ''
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000009000
AddressAlign: 0x0000000000000001
- Name: .note.gnu.gold-version
Type: SHT_NOTE
AddressAlign: 0x0000000000000004
Content: 040000000900000004000000474E5500676F6C6420312E3131000000
- Name: .ARM.attributes
Type: SHT_ARM_ATTRIBUTES
AddressAlign: 0x0000000000000001
Content: '4113000000616561626900010900000006020901'
...
)");
ASSERT_THAT_EXPECTED(ExpectedFile, llvm::Succeeded());
auto module_sp = std::make_shared<Module>(ExpectedFile->moduleSpec());
auto entry_point_addr = module_sp->GetObjectFile()->GetEntryPointAddress();
ASSERT_TRUE(entry_point_addr.GetOffset() & 1);
// Decrease the offsite by 1 to make it into a breakable address since this
// is Thumb.
entry_point_addr.SetOffset(entry_point_addr.GetOffset() - 1);
ASSERT_EQ(entry_point_addr.GetAddressClass(),
AddressClass::eCodeAlternateISA);
}
TEST_F(ObjectFileELFTest, GetSymtab_NoSymEntryPointArmAddressClass) {
/*
// nosym-entrypoint-arm.s
_start:
movs r0, #42
movs r7, #1
svc #0
// arm-linux-androideabi-as nosym-entrypoint-arm.s
// -o nosym-entrypoint-arm.o
// arm-linux-androideabi-ld nosym-entrypoint-arm.o
// -o nosym-entrypoint-arm -e 0x8074 -s
*/
auto ExpectedFile = TestFile::fromYaml(R"(
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: EM_ARM
Flags: [ EF_ARM_SOFT_FLOAT, EF_ARM_EABI_VER5 ]
Entry: 0x0000000000008074
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x0000000000008074
AddressAlign: 0x0000000000000004
Content: 2A00A0E30170A0E3000000EF
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000009000
AddressAlign: 0x0000000000000001
Content: ''
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
Address: 0x0000000000009000
AddressAlign: 0x0000000000000001
- Name: .note.gnu.gold-version
Type: SHT_NOTE
AddressAlign: 0x0000000000000004
Content: 040000000900000004000000474E5500676F6C6420312E3131000000
- Name: .ARM.attributes
Type: SHT_ARM_ATTRIBUTES
AddressAlign: 0x0000000000000001
Content: '4113000000616561626900010900000006010801'
...
)");
ASSERT_THAT_EXPECTED(ExpectedFile, llvm::Succeeded());
auto module_sp = std::make_shared<Module>(ExpectedFile->moduleSpec());
auto entry_point_addr = module_sp->GetObjectFile()->GetEntryPointAddress();
ASSERT_EQ(entry_point_addr.GetAddressClass(), AddressClass::eCode);
}
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